Changes in milk yield in dairy cows associated with metabolic and reproductive disease and lameness |
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| Affiliation: | 1. Farm Technology Group, Wageningen University and Research, PO Box 16, Wageningen, 6700 AA, the Netherlands;2. Smart Component Department, Lely Industries N.V., Cornelis van der Lelylaan 1, Maassluis, 3147 PB, the Netherlands;3. Animal Production Systems Group, Wageningen University and Research, PO Box 338, Wageningen, 6700 AH, the Netherlands;1. University of Nottingham, School of Veterinary Medicine and Science, Sutton Bonington Campus, Sutton Bonington, LE12 5RD, United Kingdom;2. University of Nottingham, School of Biosciences, Sutton Bonington Campus, Sutton Bonington, LE12 5RD, United Kingdom;2. Faculdade de Medicina Veterinária, Animal Behaviour and Welfare Research Lab, Centre for Interdisciplinary Research in Animal Health (CIISA), Universidade de Lisboa, Polo Alto da Ajuda, 12 1300-477, Lisbon, Portugal;3. Centre for Management Studies, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001, Lisbon, Portugal;4. Laboratorio di Benessere Animale, Etologia Applicata e Produzioni Sostenibili, Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Via G. Celoria 10, 20133 Milan, Italy;2. Embrapa Dairy Cattle, 36038-330 Juiz de Fora, MG, Brazil;3. Department of Animal Science, Federal University of Rio Grande do Sul, 90040-060, Porto Alegre, RS, Brazil;1. Laboratorio de Etologia Aplicada e Bem-Estar Animal, Departamento de Zootecnia e Desenvolvimento Rural, Universidade Federal de Santa Catarina, Florianópolis, Brazil;2. Animal Welfare Program, 2357 Main Mall, Faculty of Food and Land Systems, University of British Columbia, V6T 1Z4, Vancouver, Canada;3. Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Box 7068, Uppsala, Sweden;1. School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington Campus, Leicestershire LE12 5RD, United Kingdom;2. School of Mathematical Sciences, University Park, University of Nottingham, Nottingham, NG7 2RD, United Kingdom |
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| Abstract: | A study was undertaken of 1594 lactations occurring in 732 British Friesian, Ayrshire and Holstein crossbred cows. One thousand two-hundred of these lactations were used to consider the association between the occurrence of hypocalcaemia, ketosis, hypomagnesaemia, dystocia, retained placenta, endometritis and lameness and changes in milk yield. A statistical technique was applied which used the relationship between pairs of consecutive lactations in the same cow to assess losses in milk yield associated with disease relative to an individual's own potential. Seven hundred and seventy-two pairs of consecutive lactations from the 1200 lactations were available for this purpose.Average significant reductions of 6–7% in peak milk yield occurred in lactations in which the cow had a retained placenta or ketosis. Cows which had ketosis showed a slower decline in milk yield in later lactation and there was no overall significant difference in 305-day milk yield, However, for cows which had a retained placenta, there was no corresponding reduction in rate of decline, and 305-day milk yield was on average 7% lower. There were no significant associations between hypocalcaemia, hypomagnesaemia, dystocia or endometritis and milk yield.Cases of lameness, which occurred during a 20-week period following peak yield and were mainly associated with lesions involving the interdigital cleft and sole or white line sites of the claw, were more common in cows which had higher than average peak milk yields. Heel lesions appeared to be associated with lower than average 305-day yields, but this may have been due to variations in incidence with season. |
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